Google (okay, Alphabet) is the only big tech company that I can imagine would ultimately _benefit_ from an antitrust breakup. Google keeps killing low-to-medium profitable smaller product lines and tools because it can't spin them off successfully. Google can't spin off tools successfully because their internal codebases are deeply reliant on assumptions about Google's infrastructure and Google internal libraries, et…
It's not even so much about protecting the secret sauce as protecting user data. Every tool interfacing to the Google backend is a potential attack vector. When the time comes that nobody's willing to bear the cost to keep it updated as the core infrastructure changes, the product dies. In a world where Google is split up, that'll still be true; it'll look more like "Google CoreCloud has just changed API foo to prote…
Since most of the revenue from Google's ads are from ads on search, presumably the broken-up ads company would be buying the ad space on the broken-up search company's SERPs. All the search company's revenue would still come from the ads company.